He's made his feelings clear on the Republican presidential candidate. During one concert earlier this year, Bruce held aloft a sign that read "F*** TRUMP."

In an interview with Channel 4's Matt Frei, The Boss said that Trump is going to make as "much of a mess as he can" but the legendary musician is convinced he'll lose.

“The trouble at the moment is you have Donald Trump who is talking about rigged election and he has feeling he is going to lose now, which of course he is going to lose.

"He knows he’s going to lose. He’s such a flagrant, toxic, narcissistic that he wants to take down the entire democratic system with him if he goes. If he could reflect on these things maybe he’d have… but he’s such an unreflective person."

“He simply has no sense of decency and no sense of responsibility about him. And the words that he’s been using over the past several weeks really are an attack on the entire democratic process.”

On Sunday, Trump made a string of furious claims that the election is rigged against him and claimed that Hillary Clinton used drugs to enhance her debate performance. Bruce thinks that Trump's floating of these conspiracy theories will create a dangerous mess.

He said: “I think that’s very dangerous. He has a lot of people’s ears, and I don’t think he’s going to go quietly, gently into the good night. He’s going to make as a big a mess as he can. And I don’t know what that’s going to mean but we’ll find out shortly.”